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| Russian | English |
| азотистое основание | nucleobase (=nitrogenous base ("In the biological sciences, nitrogenous bases are increasingly termed nucleobases because of their role in nucleic acids..." –  wikipedia.org Aniry) |
| мутаген – аналог азотистого основания | base analog mutagene |
| пара азотистых оснований | base pair |